how to set indendent window sizes

how can you set each window to have its own size. the reason i ask is because i have tried to organise my folders according to their contents eg. pics,movies,games,apps etc. for pics and movies i like to see large or extra large icons so i can see a preview, but in other folders i prefer the medium or small icons so they arent previewed because previews for games or apps isnt very practical.

but after changing the icon size for one folder, ALL the others are the same, so i want individual settings for each folder.